/*
* Update each tick
* Time is the percentage of the way through the duration
*/
void PageTurn3D::update(float time)
{
float tt = MAX(0, time - 0.25f);
float deltaAy = (tt * tt * 500);
float ay = -100 - deltaAy;
float deltaTheta = sqrtf(time);
float theta = deltaTheta>0.5?(float)M_PI_2*deltaTheta:(float)M_PI_2*(1-deltaTheta);
float rotateByYAxis = (2-time)* M_PI;
float sinTheta = sinf(theta);
float cosTheta = cosf(theta);
for (int i = 0; i <= _gridSize.width; ++i)
{
for (int j = 0; j <= _gridSize.height; ++j)
{
// Get original vertex
Vec3 p = getOriginalVertex(Vec2(i ,j));
p.x -= getGridRect().origin.x;
float R = sqrtf((p.x * p.x) + ((p.y - ay) * (p.y - ay)));
float r = R * sinTheta;
float alpha = asinf( p.x / R );
float beta = alpha / sinTheta;
float cosBeta = cosf( beta );
// If beta > PI then we've wrapped around the cone
// Reduce the radius to stop these points interfering with others
if (beta <= M_PI)
{
p.x = ( r * sinf(beta));
}
else
{
// Force X = 0 to stop wrapped
// points
p.x = 0;
}
p.y = ( R + ay - ( r * (1 - cosBeta) * sinTheta));
// We scale z here to avoid the animation being
// too much bigger than the screen due to perspective transform
p.z = (r * ( 1 - cosBeta ) * cosTheta);// "100" didn't work for
p.x = p.z * sinf(rotateByYAxis) + p.x * cosf(rotateByYAxis);
p.z = p.z * cosf(rotateByYAxis) - p.x * sinf(rotateByYAxis);
p.z/=7;
// Stop z coord from dropping beneath underlying page in a transition
// issue #751
if( p.z < 0.5f )
{
p.z = 0.5f;
}
// Set new coords
p.x += getGridRect().origin.x;
setVertex(Vec2(i, j), p);
}
}
}
QRectF GraphicsGridItem::boundingRect() const
{
return getGridRect();
}